/* This file is part of the Palabos library.
 *
 * The Palabos softare is developed since 2011 by FlowKit-Numeca Group Sarl
 * (Switzerland) and the University of Geneva (Switzerland), which jointly
 * own the IP rights for most of the code base. Since October 2019, the
 * Palabos project is maintained by the University of Geneva and accepts
 * source code contributions from the community.
 *
 * Contact:
 * Jonas Latt
 * Computer Science Department
 * University of Geneva
 * 7 Route de Drize
 * 1227 Carouge, Switzerland
 * jonas.latt@unige.ch
 *
 * The most recent release of Palabos can be downloaded at
 * <https://palabos.unige.ch/>
 *
 * The library Palabos is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * The library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef DEFAULT_MULTI_GRID_POLICY_2D_H
#define DEFAULT_MULTI_GRID_POLICY_2D_H

#include <cmath>

#include "multiBlock/defaultMultiBlockPolicy2D.h"
#include "multiGrid/multiGrid2D.h"
#include "multiGrid/multiGridManagement2D.h"

namespace plb {

class DefaultMultiGridPolicy2D {
public:
    /// return a default communicator for a multiGrid with a number of levels
    template <typename T>
    std::vector<BlockCommunicator2D *> getBlockCommunicator(plint levels)
    {
        PLB_ASSERT(levels > 0);
        std::vector<BlockCommunicator2D *> res;
        for (int i = 0; i < levels; ++i) {
            res.push_back(defaultMultiBlockPolicy2D().getBlockCommunicator());
        }
        return res;
    }

    /// return a default MultiGridManagement2D
    MultiGridManagement2D getMultiGridManagement(
        plint nx, plint ny, plint numLevels, plint referenceLevel)
    {
        return MultiGridManagement2D(nx, ny, numLevels, referenceLevel);
    }

    /// return a vector of CombinedStatistics
    std::vector<CombinedStatistics *> getCombinedStatistics(plint levels)
    {
        PLB_ASSERT(levels > 0);
        std::vector<CombinedStatistics *> stats(levels);
        for (int i = 0; i < levels; ++i) {
            // it will be defaultMultiBlockPolicy2D who will give us serial or parallel
            stats[i] = defaultMultiBlockPolicy2D().getCombinedStatistics();
        }
        return stats;
    }

    friend DefaultMultiGridPolicy2D &defaultMultiGridPolicy2D();

private:
    DefaultMultiGridPolicy2D() : numProcesses(global::mpi().getSize()) { }

private:
    int numProcesses;
};

inline DefaultMultiGridPolicy2D &defaultMultiGridPolicy2D()
{
    static DefaultMultiGridPolicy2D singleton;
    return singleton;
}

}  // namespace plb

#endif  // DEFAULT_MULTI_GRID_POLICY_2D_H
